Bootstrap Getting Started
Getting started · Bootstrap
PHP Getting Started
PHP: Getting Started - Manual
MySQL Getting Started (you want to move to MariaDB but the principles are the same)
https://dev.mysql.com/usingmysql/get_started.html
It's best to use a PHP Framework once you learn these things. I suggest Laravel - but before learning Laravel you must understand Object Oriented Programming principles.
Laravel
https://laravel.com
These are behind a paywall - but Laracasts is worth every cent.
Object Oriented Bootcamp
https://laracasts.com/series/object-...ootcamp-in-php
PHP 7 Intro and Primer
https://laracasts.com/series/php7-up-and-running
Laravel 5 from Scratch
https://laracasts.com/series/laravel-5-from-scratch
Once you know Laravel then creating a Bootstrap site with authentication can be done in a few commands.
Code:
#laravel new project
#cd project
#php artisan make:auth
#php artisan migrate
fast, easy, done.